content: /*
   * Copyright 2011-2016 David Karnok
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package ix;
  
  import java.util.*;
  
  final class IxReverse<T> extends IxSource<T, T> {
  
      IxReverse(Iterable<T> source) {
          super(source);
      }
  
      @Override
      public Iterator<T> iterator() {
          return new ReverseIterator<T>(source.iterator());
      }
  
      static final class ReverseIterator<T> extends IxSourceIterator<T, T> {
  
          List<T> list;
  
          int index;
  
          ReverseIterator(Iterator<T> it) {
              super(it);
          }
  
          @Override
          protected boolean moveNext() {
              List<T> list = this.list;
  
              if (list == null) {
                  list = new ArrayList<T>();
                  this.list = list;
                  while (it.hasNext()) {
                      list.add(it.next());
                  }
                  index = list.size();
              }
  
              int i = index;
              if (i == 0) {
                  done = true;
                  return false;
              }
              value = list.get(i - 1);
              hasValue = true;
              index = i - 1;
              return true;
          }
      }
  }
  